Improvement in heaters for steasvi fire-engines



W. F. SHAW.

Heaters for Seam Fire-Engines.

Nm 142,589, Patented September9,l873.

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WILLIAM F. SHAW, on BOSTON, MASSAOHUSETTS, AsSIeNOn r.rO HIMSELF ANDDAvID SHARP, On SAME PLAcn.

IMPROVEMENT IN HEATERS FOR STEAM FIRE-ENGINES.

Speciication forming partof Letters Patent hlm-142,589, dated Ss-pttmber9, 1873; application tiled August 13, 1873.

To all whom it may concern:

Be it known that I, WILLIAM F. SHAW, of the county Of Suffolk and Stateof Massachusetts, have invented a new and useful Water- Heater for SteamFire-Engines; and do hereby declare the same to be fully described inthe following specication and represented in the accompanying drawings,of which- Figure 1 denotes a front elevation, Fig. 2 a vertical andtransverse section, and Fig. 3 a horizontal section, Of it.

In October 22, 1872, a patent (No. 132,488) was granted On awater-heater for fire-engines, the inventor being Alfred Il. Perry. Incarrying out my invention I hav-e combined with such water-heater anexternal case and concentric heating-chamber, the case being providedwith a chambered head. I have also provided the inner Or coil chamberwith an annular trough, arranged at its lower part, and to intercept anycondensed vapor or product of combustion that may gather upon the innervertical surface of the chamber, and fall or run down therefrom. f

`In the drawings, A and B denote two `concentric cylinders, providedWith domed tops C D, and arranged so that there may be a concentricWater-holding space, E, between the cylinders, and also between theirtops, as shown. Within the inner cylinder A is a coil or helical tube,F, it being arranged as represented, and having its extremities "Openinginto the water space, which, at top, has an educt or pipe, G, and atbottom an induct Or pipe, H, all Of which is substantially like thewater-heater constituting the subject Ot the said'patent, and is tO beheated by a lamp or burners arranged within or directly under thecylinder A.

I have encompassed such water-heater by a concentric case, I, to extendaround and Over'it, as represented, and so that there may be a chamberor space, K, between the two, it extending over and around theWater-heater, This case I may be provided with a chamber, a, Within itsupper part or top, tO contain air, and prevent waste Ot heat. There areto be sundry pipes b b, .leading from the heating Or coil chamber withinthe water-heater ulpintc the Outer heatingchambcr K, the latter, at ornear its bottom, being provided with sundry eduets Or holes c c forescape Of the smoke or spent volatile products of combustion.A At thebottom Ot' the inner heatingchamber'is the concentric trough L, whichextends around the chamber and serves tO intercept any Of the productsof combustion that may gather On the inner surface of the sides of theheatin g-chamber and fall therefrom, the object of 4the trough being toprevent such products from getting on the door Or supporter of thewater-heater and soiling it.

I sometimes form the outer case of two concentric cylinders, with anair-space between them.

In the Operation of my new water-heater, the heat and volatile productsof combustion from the ame of the burner placed at the base of theheater, after circulating in contact with the coil and inner surface ofthe inner chamber, escape by the pipes b into the puter heating-chamberK, and thence ilow downoutside of the water-holding vessel, and

' heat it, the spent products escaping by the holes c.

The water-vessel, when the apparatus is in use, is to be connected bypipes at top and bottom with a boiler, the whole being so that waterfrom the latter may ilow into the chamber E at bottom, and back out Ofit at top, such Waterbeing heated while passing through the space orvessel E.

My additions to the patented Water-heater effect a material saving infuel or gas, and for heating the water.

I claim- 1. The combination of theexternal heatingy chamber K and one ormore pipes, b, with the coil F and Water-holding vessel or space E,arranged and connected, as described, all being for use and to operateessentially as set forth.

2. The water-heater, as provided with the intercepting-trough L arrangedin it, as and for the purpose substantially as S'pecied.

. W. F. SHAW.

Witnesses:

It. II. EDDY, J. SNOW.

